CN106871121A - Multisection type all-premixing burner with smoke reflux device - Google Patents
Multisection type all-premixing burner with smoke reflux device Download PDFInfo
- Publication number
- CN106871121A CN106871121A CN201710213284.6A CN201710213284A CN106871121A CN 106871121 A CN106871121 A CN 106871121A CN 201710213284 A CN201710213284 A CN 201710213284A CN 106871121 A CN106871121 A CN 106871121A
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- China
- Prior art keywords
- combustion
- combustion head
- burner
- smoke
- multisection type
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/12—Radiant burners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2202/00—Fluegas recirculation
- F23C2202/20—Premixing fluegas with fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2203/00—Gaseous fuel burners
- F23D2203/002—Radiant burner mixing tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2203/00—Gaseous fuel burners
- F23D2203/005—Radiant burner heads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
- F23D2900/14—Special features of gas burners
- F23D2900/1412—Special features of gas burners for radiant burners
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention discloses a kind of multisection type all-premixing burner with smoke reflux device,Including blower fan,Burner body,Also include smoke reflux device,Blower fan uses frequency conversion fan,Burner body includes Gas Pipe,Premix chamber,Ignition system,Attachment means between combustion head and combustion head,Combustion head also includes multi-section-combustion head,Attachment means are set between multisection type combustion head,Swirl vane is provided with premix chamber,Swirl vane is connected gaseous mixture with premix chamber combustion barrel inwall by swirl vane eddy flow by welding manner,Increase gaseous mixture premixing effect,Smoke backflow pipe first passes through smoke filter and filters out the particles such as flue dust after drawing,High-temperature flue gas are depressurized by pressure-reducing valve again,Mixed with the combustion gas in burner Gas Pipe again after decompression,Multisection type all-premixing burner with smoke reflux device of the invention makes full use of the flue gas of high temperature reflux,Improve efficiency of combustion,And reduce the discharge of nitrogen oxides.
Description
Technical field
The present invention relates to a kind of combustion apparatus, more particularly to a kind of multisection type full premix combustion with smoke reflux device
Device.
Background technology
Premixed combustion is that fuel and oxygen or air are pre-mixed as uniform gaseous mixture, and the gaseous mixture after premixing exists
The process caught fire in burner, burnt.
A kind of all-premixing burner, including burner housing and burning are disclosed in the U of Chinese patent CN 203147762
The fire output hole plate that device shell is fixedly connected, burner housing is made up of fixed plate, support and distribution plate, fixed plate, support, distribution
Plate surrounds mixing chamber, and distribution plate is provided with the dispensing orifice passed through for mixed gas, and fire output hole plate is arranged on burner housing air-flow
The downstream in direction, but such all-premixing burner is primarily adapted for use in the small gas such as wall-hung boiler tool field.
The content of the invention
Multisection type all-premixing burner technical problem to be solved with smoke reflux device of the invention is offer one
Kind of burning fully, the low all-premixing burner of high combustion efficiency, nitrogen oxide emission, for boiler heating, supplying hot water or do
It is the combustion apparatus in large scale industry boiler.
In order to solve the above technical problems, present invention employs following technical scheme：Multisection type with smoke reflux device
All-premixing burner, including blower fan, burner body, also including smoke reflux device.
The blower fan uses frequency conversion fan, and the rotating speed of blower fan is changed by variable frequency regulating speed control, so that change fan delivery,
Frequency conversion fan can realize the stepless speed regulation of blower fan, compared with traditional deep bead or valve dam regulative mode, frequency conversion
Fan operation economy, with obvious power savings.
Wherein, blower fan is connected by blower fan flange with burner body.
The burner body includes attachment means between Gas Pipe, premix chamber, ignition system, combustion head and combustion head.
Wherein, Gas Pipe connects with the combustion barrel of blower fan right-hand member, and combustion gas valve group is additionally provided with Gas Pipe, and combustion gas passes through combustion gas
Enter combustion head front end gas cylinder after valve group filtering decompression.
Wherein, premix chamber is in gas cylinder.
Wherein, the combustion gas that the air and Gas Pipe that blower fan enters enter mixes into combustion barrel, is pre-mixed in premix chamber
Enter combustion head afterwards to burn.
Wherein, ignition system includes ignitron, ignition electrode and flame detector, and ignition system is located at combustion barrel peripheral side,
One end is stretched on the outside of burner flange and is connected with electrical system, and the other end stretches to combustion head leading portion, flame detector probe with
Combustion head metal web felt is mutually pressed close to.
Especially, swirl vane is provided with premix chamber, gaseous mixture increases gaseous mixture premixing effect by swirl vane eddy flow
Really.
Further technical scheme is：Combustion head includes punched-plate, metal web felt, and combustion head passes through burner method
Orchid is connected with the gas cylinder at premix chamber end, and combustion head is divided into one section of combustion head and two sections of combustion heads, or multi-section-combustion again
Head, combustion head front end is connected by stainless steel ring with combustion barrel, and the other end is blocked with plug, uses stainless steel ring welded seal.
Wherein, metallic fiber is made the special fibre with space network for siderochrome manganese alloy by weaving manner
Dimension, the aperture with pitch-row is minimum, as fabric, permeability is good, resistance to oxidation, resistance to ablation, both the durability with metal, has again
There is the pliability of fiber, can be processed into variously-shaped；Using stainless steel punched-plate as lining material cylindrical structural, it is stainless
The lining of steel punched-plate is that ensure that passing through for combustion gas, and for soft metal fiber felt provides support, has burner
Certain mechanical strength.In addition to combustion head metallic fiber part, remainder component is made burner using Stainless Steel material
Form, it is overall that there is good mechanical strength, heat resistance and corrosion resistance.
Especially, attachment means are set between multisection type combustion head.
Wherein, combustion head attachment means, combustion head are provided with the middle of one section of combustion head end and two sections of combustion head front end plugs
Attachment means include waffle slab, reinforcement and stable connection part.
Wherein, one waffle slab, waffle slab external diameter and combustion are respectively set in one section of combustion head end and two sections of combustion head front ends
Burn head external diameter identical, one section of combustion head end and two sections of outer Monday lap weldings of the combustion head joint of combustion head front end two connect stainless steel
Ring, stainless steel ring upper and lower side respectively sets reinforcement at two, reinforcement connection combustion head stainless steel ring and stable connection part, and connection is steady
Firmware is the stainless steel plate of welding, makes to connect held stationary between one section of combustion head and two sections of combustion heads.
Further technical scheme is：The smoke reflux device includes smoke backflow pipe, smoke filter, pressure-reducing valve
And air-introduced machine.Smoke backflow pipe is drawn from Boiler smoke tube, and the Gas Pipe with burner front end is connected.
Wherein, smoke backflow pipe first passes through smoke filter and filters out the particles such as flue dust after drawing, then by pressure-reducing valve pair
High-temperature flue gas are depressurized, and are mixed with the combustion gas in burner Gas Pipe again after decompression.
Especially, flue gas also increases air-introduced machine after decompression before entering burner Gas Pipe, and air-introduced machine passes through frequency control
Control flue gas enters the exhaust gas volumn of burner.
The full premixed device of multisection type of the present invention can be widely used in very much Boiler heating, it is also possible to meet various large scale industries
The requirement of boiler combustion equipment.
The beneficial effects of the present invention are：
（1）Burner is full premix combustion, flame in the burning uniform blue combustion of head surface, flameholding, fully；
（2）Burner combustion head profile strong adaptability, is particularly well-suited in coal-fired old boiler transformation and large scale industry boiler；
（3）All-premixing burner surface calorific intensity is high, and sound construction, the connection of multi-section-combustion head are easily changed；
（4）According to use occasion and the requirement of required burning load, combustion head hop count can also be adjusted flexibly；
（5）When using, quick heating, quick cooling, combustion conditions are good, are difficult tempering, and CO, NOx ratio often use burner in flue gas
It is much lower, pollute small, be conducive to improving air quality.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention.
Fig. 2 is burner body schematic diagram of the present invention.
Fig. 3 is premix chamber structural representation of the present invention.
Fig. 4 is premix chamber swirl vane schematic diagram of the present invention.
Fig. 5 is waffle slab and stainless steel ring schematic diagram between two stage combustion of the present invention head.
Fig. 6 is attachment means schematic diagram between two stage combustion of the present invention head.
Wherein, in the accompanying drawings：11- blower fans, 12- blower fan flanges, 13- burner flanges, 14- premix chambers, 15- eddy flow leaves
Piece, 21- Gas Pipes, 22- combustion gas pipe flanges, 30- smoke pipes, 31- smoke filters, 32- pressure-reducing valves, 33- smoke backflow pipes, 34-
Air-introduced machine, 50- burner hearths, 101- ignitrons, 102- flame detectors, 103- ignition electrodes, mono- section of combustion head of 201-, bis- sections of combustions of 202-
Burn head, 203- punched-plates, metallic fiber website, 301- attachment means, 302- stainless steel rings, 303- plugs, stainless steel ring, 304-
Waffle slab, 305- reinforcements, 306- stable connection parts.
Specific embodiment
The technical scheme made to the present invention below in conjunction with drawings and the specific embodiments in embodiment is further retouched in detail
State.Obviously, described embodiment is only a part of embodiment of the invention, rather than whole embodiments, based on this hair
Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to the scope of protection of the invention.
Referring to Figures 1 and 2, Fig. 1 is schematic structural view of the invention, and Fig. 2 is burner body schematic diagram of the present invention.Band flue gas
The multisection type all-premixing burner of reflux, including blower fan 11, burner body, also including smoke reflux device, blower fan 11
Using frequency conversion fan, the rotating speed of blower fan is changed by variable frequency regulating speed control, so as to change fan delivery, blower fan 11 passes through blower fan method
Blue 12 are connected with burner body；Burner body includes Gas Pipe 21, premix chamber 14, ignition system, combustion head and combustion head
Between attachment means 301, premix chamber 14 is in gas cylinder, combustion head includes punched-plate, metal web felt 203, stainless steel punching
Used as liner, metal web felt is wrapped in punched-plate outer layer to orifice plate, and combustion head is by burner flange 13 and the end of premix chamber 14
Gas cylinder connection；Gas Pipe 21 connects with the combustion barrel of the right-hand member of blower fan 11, and combustion gas valve group is additionally provided with Gas Pipe 21, and combustion gas is led to
Enter combustion head front end gas cylinder after crossing the filtering decompression of combustion gas valve group, the combustion gas that the air and Gas Pipe 21 that blower fan 11 enters enter
Into combustion barrel mixing, combustion head surface combustion is entered after being pre-mixed in premix chamber 14.Reference picture 2, ignition system includes point
Fire tube 101, ignition electrode 103 and flame detector 102, ignition system are located at combustion barrel peripheral side, and one end is stretched in burner flange
13 outsides simultaneously connect with electrical system, and the other end stretches to combustion head leading portion, the probe of flame detector 102 and combustion head metallic fiber
Net felt 203 is mutually pressed close to.In the present embodiment, combustion head is divided into one section of combustion head and 201 2 sections of combustion heads 202, or multistage
Combustion head, combustion head front end is connected by stainless steel ring 302 with combustion barrel, and the other end is blocked with plug, is welded with stainless steel ring 303
Sealing is connect, especially, attachment means 301 are set between multisection type combustion head.
With continued reference to Fig. 1, smoke reflux device includes smoke backflow pipe 33, smoke filter 31, pressure-reducing valve 32 and air inducing
Machine 34.Smoke backflow pipe 33 is drawn from Boiler smoke tube 30, is connected with the Gas Pipe 21 of burner front end.Smoke backflow pipe 33 draws
Smoke filter 31 is first passed through after going out and filters out the particles such as flue dust, then high-temperature flue gas are depressurized by pressure-reducing valve 32, depressurized
Mixed with the combustion gas in burner Gas Pipe 21 again afterwards.Especially, before flue gas enters burner Gas Pipe 21 after decompression also
Increase air-introduced machine 34, air-introduced machine 34 enters the exhaust gas volumn of burner by variable frequency regulating speed control flue gas, by high-temperature flue gas
Utilize, increase efficiency of combustion, and reduce pollutant emission.
Reference picture 3, Fig. 3 is premix chamber structural representation of the present invention, and two swirl vanes 15 are provided with premix chamber 14, is mixed
Gas increases gaseous mixture premixing effect by the eddy flow of swirl vane 15, makes mixture combustion more abundant.
Reference picture 4, Fig. 4 is premix chamber swirl vane schematic diagram of the present invention, and swirl vane 15 makes for stainless steel plate, middle
It is hollow tubular fixing axle, swirl vane 15 is connected by welding manner with combustion barrel inwall in premix chamber 14.
Reference picture 5 and Fig. 6, Fig. 5 are waffle slab and stainless steel ring schematic diagram between two stage combustion of the present invention head, and Fig. 6 is this
Attachment means schematic diagram between invention two stage combustion head.In the middle of one section of end of combustion head 201 and two sections of front end plugs of combustion head 202
Combustion head attachment means 301 are provided with, combustion head attachment means 301 include waffle slab 304, reinforcement 305 and stable connection part
306.Wherein, one waffle slab 304, waffle slab 304 are respectively set in one section of end of combustion head 201 and two sections of front ends of combustion head 202
External diameter is identical with combustion head external diameter, Mondays outside one section of end of combustion head 201 and two sections of combustion head joints of 202 front end of combustion head two
Lap welding connects stainless steel ring 302, and stainless steel ring upper and lower side respectively sets reinforcement 305 at two, the connection combustion head stainless steel of reinforcement 305
Ring 302 and stable connection part 306, stable connection part 306 is the stainless steel plate of welding, makes one section of combustion head 201 and two sections of burnings
Held stationary is connected between first 202.
With two stage combustion head as embodiment in drawings and the specific embodiments of the present invention, it is also possible to be different from using other
The other modes of this description are implemented, and those skilled in the art can do similar pushing away in the case of without prejudice to intension of the present invention
Extensively, therefore the present invention is not limited by specific embodiment disclosed in face above.
Claims (7)
1. the multisection type all-premixing burner with smoke reflux device, including blower fan, burner body, also fill including smoke backflow
Put, blower fan uses frequency conversion fan, and burner body between Gas Pipe, premix chamber, ignition system, combustion head and combustion head including connecting
Device, it is characterised in that：Combustion head also includes multi-section-combustion head, and attachment means, attachment means are set between multisection type combustion head
Including waffle slab, reinforcement and stable connection part, one grid is respectively set in one section of combustion head end and two sections of combustion head front ends
Plate, waffle slab external diameter is identical with combustion head external diameter, outside one section of combustion head end and two sections of combustion head joints of combustion head front end two
Monday lap welding connects stainless steel ring, and stainless steel ring upper and lower side respectively sets reinforcement at two, reinforcement connection combustion head stainless steel ring with
Stable connection part, stable connection part is the stainless steel plate of welding；
Especially, increased smoke reflux device includes smoke backflow pipe, smoke filter, pressure-reducing valve and air-introduced machine, and flue gas is returned
Flow tube is drawn from Boiler smoke tube, and the Gas Pipe with burner front end is connected.
2. the multisection type all-premixing burner with smoke reflux device according to claim 1, it is characterised in that：Blower fan passes through
Blower fan flange is connected with burner body.
3. the multisection type all-premixing burner with smoke reflux device according to claim 1, it is characterised in that：The premix
Swirl vane is provided with chamber, swirl vane is connected gaseous mixture with premix chamber combustion barrel inwall by eddy flow leaf by welding manner
Piece eddy flow, increases gaseous mixture premixing effect.
4. the multisection type all-premixing burner with smoke reflux device according to claim 1, it is characterised in that：The burning
Head includes punched-plate, metal fiber felt, and combustion head is connected by burner flange with the gas cylinder at premix chamber end, and combustion head is divided into
One section of combustion head and two sections of combustion heads, combustion head front end are connected by stainless steel ring with combustion barrel, and the other end is blocked with plug, are used
Stainless steel ring welded seal.
5. the multisection type all-premixing burner with smoke reflux device according to claim 1, it is characterised in that：The igniting
System includes ignitron, ignition electrode and flame detector, and ignition system is located at combustion barrel peripheral side, and one end is stretched in burner flange
Outside simultaneously connects with electrical system, and the other end stretches to combustion head leading portion, flame detector probe and combustion head metal web felt
Mutually press close to.
6. the multisection type all-premixing burner with smoke reflux device according to claim 1, it is characterised in that：The flue gas
Return duct first passes through smoke filter and filters out the particles such as flue dust after drawing, then high-temperature flue gas are depressurized by pressure-reducing valve,
Mixed with the combustion gas in burner Gas Pipe again after decompression.
7. the multisection type all-premixing burner with smoke reflux device according to claim 1 and 6, it is characterised in that：Decompression
Flue gas also increases air-introduced machine afterwards before entering burner Gas Pipe, and air-introduced machine enters burner by variable frequency regulating speed control flue gas
Exhaust gas volumn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710213284.6A CN106871121A (en) | 2017-04-01 | 2017-04-01 | Multisection type all-premixing burner with smoke reflux device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710213284.6A CN106871121A (en) | 2017-04-01 | 2017-04-01 | Multisection type all-premixing burner with smoke reflux device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106871121A true CN106871121A (en) | 2017-06-20 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710213284.6A Pending CN106871121A (en) | 2017-04-01 | 2017-04-01 | Multisection type all-premixing burner with smoke reflux device |
Country Status (1)
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|---|---|
| CN (1) | CN106871121A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108548179A (en) * | 2018-04-24 | 2018-09-18 | 东北大学 | One kind is from preheated burning formula directed radiation pipe heating device |
| CN109307268A (en) * | 2017-07-29 | 2019-02-05 | 上海钜荷热力技术有限公司 | A kind of flue gas is interior to recycle all-premixing burner |
| CN111237758A (en) * | 2019-12-27 | 2020-06-05 | 郑州釜鼎热能技术有限公司 | Combustion device for premixed airflow high-speed rotational flow jet flue gas backflow low-nitrogen combustion |
| CN111998326A (en) * | 2020-09-02 | 2020-11-27 | 河南永兴锅炉集团有限公司 | Double-ring circular full water-cooling central cylinder for natural gas boiler burner |
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| CN102072489A (en) * | 2011-02-25 | 2011-05-25 | 凯明企业有限公司 | Combustor |
| CN102278759A (en) * | 2011-08-10 | 2011-12-14 | 大连经济技术开发区水国燃烧器有限公司 | Combustion head of radiant tube |
| CN205782921U (en) * | 2016-06-01 | 2016-12-07 | 高台县聚庆新能源设备有限公司 | Circulating flue gas reverse-flow type all-premixing burner in a kind of |
| CN205878158U (en) * | 2016-06-02 | 2017-01-11 | 高台县聚庆新能源设备有限公司 | Vane type gas air premixing device |
| CN205979772U (en) * | 2016-05-23 | 2017-02-22 | 高台县聚庆新能源设备有限公司 | Outer recirculated flue gas backward flow formula full premix combustor |
| CN208349290U (en) * | 2017-04-01 | 2019-01-08 | 上海钜荷热力技术有限公司 | Multisection type all-premixing burner with smoke reflux device |
-
2017
- 2017-04-01 CN CN201710213284.6A patent/CN106871121A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102072489A (en) * | 2011-02-25 | 2011-05-25 | 凯明企业有限公司 | Combustor |
| CN102278759A (en) * | 2011-08-10 | 2011-12-14 | 大连经济技术开发区水国燃烧器有限公司 | Combustion head of radiant tube |
| CN205979772U (en) * | 2016-05-23 | 2017-02-22 | 高台县聚庆新能源设备有限公司 | Outer recirculated flue gas backward flow formula full premix combustor |
| CN205782921U (en) * | 2016-06-01 | 2016-12-07 | 高台县聚庆新能源设备有限公司 | Circulating flue gas reverse-flow type all-premixing burner in a kind of |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109307268A (en) * | 2017-07-29 | 2019-02-05 | 上海钜荷热力技术有限公司 | A kind of flue gas is interior to recycle all-premixing burner |
| CN108548179A (en) * | 2018-04-24 | 2018-09-18 | 东北大学 | One kind is from preheated burning formula directed radiation pipe heating device |
| CN108548179B (en) * | 2018-04-24 | 2019-06-04 | 东北大学 | One kind is from preheated burning formula directed radiation pipe heating device |
| CN111237758A (en) * | 2019-12-27 | 2020-06-05 | 郑州釜鼎热能技术有限公司 | Combustion device for premixed airflow high-speed rotational flow jet flue gas backflow low-nitrogen combustion |
| CN111998326A (en) * | 2020-09-02 | 2020-11-27 | 河南永兴锅炉集团有限公司 | Double-ring circular full water-cooling central cylinder for natural gas boiler burner |
| CN111998326B (en) * | 2020-09-02 | 2022-03-29 | 河南永兴锅炉集团有限公司 | Natural gas fired boiler with double-ring circular full water-cooling central cylinder for burner |
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Application publication date: 20170620 |
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